Carrier Heat Pump 38EYA User Manual

38EYA  
12 SEER Split-System  
Heat Pump with Puron®  
Installation and Start-Up Instructions  
NOTE: Read the entire instruction manual before starting the  
installation.  
This symbol indicates a change since the last issue.  
SAFETY CONSIDERATIONS  
Improper installation, adjustment, alteration, service, maintenance,  
or use can cause explosion, fire, electrical shock, or other  
conditions which may cause death, personal injury, or property  
damage. Consult a qualified installer, service agency, or your  
distributor or branch for information or assistance. The qualified  
installer or agency must use factory-authorized kits or accessories  
when modifying this product. Refer to the individual instructions  
packaged with the kits or accessories when installing.  
Follow all safety codes. Wear safety glasses, protective clothing,  
and work gloves. Use quenching cloth for brazing operations.  
Have fire extinguisher available. Read these instructions thor-  
oughly and follow all warnings or cautions included in literature  
and attached to the unit. Consult local building codes and National  
Electrical Code (NEC) for special requirements.  
A99327  
Recognize safety information. This is the safety-alert symbol  
.
Fig. 1—Model 38EYA  
When you see this symbol on the unit and in instructions or  
manuals, be alert to the potential for personal injury.  
4. Leave some slack between structure and unit to absorb  
vibration.  
Understand the signal words DANGER, WARNING, and CAU-  
TION. These words are used with the safety-alert symbol. DAN-  
GER identifies the most serious hazards which will result in severe  
personal injury or death. WARNING signifies hazards which  
could result in personal injury or death. CAUTION is used to  
identify unsafe practices which would result in minor personal  
injury or product and property damage.  
5. When passing refrigerant tubes through the wall, seal opening  
with RTV or other pliable silicon-based caulk. (See Fig. 2.)  
6. Avoid direct tubing contact with water pipes, duct work, floor  
joists, wall studs, floors, and walls.  
7. Do not suspend refrigerant tubing from joists and studs with a  
rigid wire or strap which comes in direct contact with tubing.  
(See Fig. 2.)  
Before installing, modifying, or servicing system, main elec-  
trical disconnect switch must be in the OFF position. There  
may be more than 1 disconnect switch. Lock out and tag  
switch with a suitable warning label. Electrical shock can  
cause personal injury or death.  
8. Ensure that tubing insulation is pliable and completely sur-  
rounds vapor tube.  
9. When necessary, use hanger straps which are 1 in. wide and  
conform to shape of tubing insulation. (See Fig. 2.)  
10. Isolate hanger straps from insulation by using metal sleeves  
bent to conform to shape of insulation.  
When outdoor unit is connected to factory-approved indoor unit,  
outdoor unit contains system refrigerant charge for operation with  
indoor unit of same size when connected by 15 ft of field-supplied  
or factory accessory tubing. Add (or subtract) 0.6 oz/ft of 3/8  
liquid line for lengths greater (or less) than 15 ft. For proper unit  
operation, check refrigerant charge using charging information  
located on control box cover and/or in the Check Charge section of  
this instruction.  
Puron® (R-410A) systems operate at higher pressures than  
standard R-22 systems. Be certain that service equipment is  
rated for Puron®. Some R-22 service equipment may not be  
acceptable. Check with your distributor.  
INSTALLATION RECOMMENDATIONS  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
1. Locate unit away from windows, patios, decks, etc. where unit  
operation sound may disturb customer.  
IMPORTANT: Maximum liquid-line size is 3/8-in. O.D. for all  
residential applications including long line.  
2. Ensure that vapor and liquid tube diameters are appropriate to  
capacity of unit.  
IMPORTANT: Always install the factory-supplied Puron® heat  
pump (bi-flow) liquid-line filter drier. If replacing the filter drier,  
refer to Product Data Digest for appropriate part number. Obtain  
replacement filter driers from your distributor or branch.  
3. Run refrigerant tubes as directly as possible by avoiding  
unnecessary turns and bends.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 5a 5a  
1
4
PC 101  
Catalog No. 533-80006  
Printed in U.S.A.  
Form 38EYA-3SI  
Pg 1  
4-01  
Replaces: 38EYA-2SI  
 
Step 5Elevate Unit  
and feeder tube going into outdoor coil. At the end of 1 of the  
feeder tubes, there is a 3/8-in. OD stub tube approximately 3 in.  
long. (See Fig. 6.) The defrost thermostat should be located on stub  
tube. Note that there is only 1 stub tube used with liquid header,  
and on most units it is the bottom circuit.  
Accumulation of water and ice in base pan may cause  
equipment damage.  
Step 8In Long-Line Applications, Install Liquid-Line  
Elevate unit per local climate and code requirements to provide  
clearance above estimated snowfall level and ensure adequate  
drainage of unit.  
Solenoid Valve (LSV)  
For refrigerant piping arrangements with equivalent lengths  
greater than 50 ft or when elevation difference between indoor and  
outdoor unit is greater than ± 20 ft, follow all requirements of the  
Long-Line Guideline section in the Application Guideline and  
COIL  
SENSING BULB  
STRAP  
SENSING  
BULB  
EQUALIZER  
TUBE  
8 O'CLOCK  
4 O'CLOCK  
THERMOSTATIC  
EXPANSION  
VALVE  
A00399  
Fig. 5Positioning of Sensing Bulb  
FEEDER TUBE  
STUB TUBE  
A88382  
Fig. 4Typical TXV Installation  
Step 6Check Indoor Expansion Device  
For proper unit operation and reliability, units must be  
installed with hard shutoff TXV specifically designed to  
operate with Puron®. Do not use R-22 TXV. Do not install  
with evaporator coils having capillary tube metering devices  
or pistons.  
DEFROST  
THERMOSTAT  
For TXV kit part number and charging instructions, refer to TXV  
label in outdoor unit.  
FURNACE COILS  
A97517  
If TXV installation is required, remove existing AccuRater® from  
indoor coil. Refer to Fig. 4 and 5 and install TXV kit (specifically  
designed for Puron®) as follows:  
Fig. 6Defrost Thermostat Location  
Service Manual for Residential Split-System Air Conditioners and  
Heat Pumps Using Puron® Refrigerant.  
1. Install suction tube adapter.  
If required by Long-Line Application Guideline, install LSV kit  
part No. KHALS0401LLS specifically designed for Puron® Heat  
Pump. LSV should be installed between filter drier and indoor coil,  
as close as possible to filter drier. Follow the Installation Instruc-  
tions included with accessory kit.  
2. Install liquid flare-to-sweat adapter.  
3. Connect external equalizer tube to fitting on suction tube  
adapter.  
4. Position sensing bulb on horizontal portion of suction tube  
adapter. Secure using supplied hardware.  
IMPORTANT: Flow arrow must point toward outdoor unit.  
Step 9Making Piping Connections  
5. Insulate bulb after installation. (See Fig. 5.)  
6. Leak check all connections.  
FAN COILS  
Relieve pressure and recover all refrigerant before system  
repair or final unit disposal to avoid personal injury or death.  
Use all service ports and open all flow-control devices,  
including solenoid valves.  
If indoor unit (fan coil) comes factory equipped with a bi-flow  
hard shutoff TXV specifically designed for Puron®, no TXV  
change is required.  
If fan coil is not designed for Puron®, a Puron® TXV installation  
is required. Refer to TXV kit Installation Instructions for details on  
TXV installation.  
Step 7Check Defrost Thermostat  
Check defrost thermostat to ensure it is properly located and  
securely attached. There is a liquid header with a brass distributor  
3
 
Table 1Refrigerant Connections and Recommended Liquid Line and Vapor Tube Diameters (In.)  
RST TUBE  
DIAMETERS  
NOT PERMITTED  
TUBE DIAMETER  
(ALTERNATE)  
CONNECTION DIAMETER  
TUBE DIAMETER  
UNIT  
SIZE  
Liquid  
3/8  
Vapor  
5/8  
Liquid  
3/8  
Vapor  
5/8  
Vapor  
3/4 ACR  
7/8  
Vapor  
3/4  
018, 024  
030  
3/8  
3/4  
3/8  
3/8  
3/8  
3/8  
3/4  
3/4  
1-1/8  
036  
3/8  
3/4  
7/8  
1-1/8  
042, 048  
060  
3/8  
7/8  
7/8  
7/8  
3/4 and 1-1/8  
3/4  
3/8  
1-1/8  
1-1/8  
7/8  
NOTES:  
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult the Application Guideline and Service Manual Residential Split-System  
Air Conditioners and Heat Pumps Using Puron® Refrigerant.  
2. Refrigerant tubes and indoor coils must be evacuated to 500 microns to minimize contamination and moisture in the system.  
SWEAT/FLARE  
ADAPTER  
Do not leave system open to atmosphere any longer than  
minimum required for installation. POE oil in compressor is  
extremely susceptible to moisture absorption. Always keep  
ends of tubing sealed during installation.  
TEFLON  
SEAL  
If ANY refrigerant tubing is buried, provide a 6 in. vertical  
rise at service valve. Refrigerant tubing lengths up to 36 in.  
may be buried.  
PISTON  
PISTON BODY  
To prevent damage to unit or service valves observe the  
LIQUID SERVICE VALVE  
following:  
Use a brazing shield  
A99441  
Wrap service valves with wet cloth or use a heat sink  
material.  
Fig. 7Liquid Service Valve with Sweat Adapter  
Tube  
Outdoor units may be connected to indoor section using accessory  
tubing package or field-supplied refrigerant grade tubing of correct  
size and condition. For tubing requirements beyond 50 ft, substan-  
tial capacity and performance losses can occur. Following the  
recommendations in the Application Guideline and Service  
Manual for Residential Split-System Air Conditioners and Heat  
Pumps using Puron® Refrigerant to minimize losses. Refer to  
Table 1 for field tubing diameters. Refer to Table 2 for accessory  
requirements.  
Refrigerant tubes and indoor coil must be evacuated to 500  
microns to minimize contamination and moisture in the system.  
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED  
INDOOR UNIT  
LIQUID-LINE  
FILTER-DRIER  
These outdoor units are carefully evaluated and listed with specific  
indoor coils for proper system performance.  
LIQUID  
SERVICE  
VALVE  
IMPORTANT: Do not apply indoor coils which are not factory  
approved to these units.  
INSTALL ADAPTER TUBE  
1. Remove plastic retainer holding outdoor piston in liquid  
service valve.  
2. Check outdoor piston size with matching number listed on unit  
rating plate.  
3. Locate plastic bag taped to unit containing adapter tube.  
4. Remove teflon washer from bag and install on open end of  
liquid service valve. (See Fig. 7.)  
A00431  
5. Remove adapter tube from bag and connect threaded nut to  
liquid service valve. Tighten nut finger tight and then with  
Fig. 8Filter Drier with Sweat Adapter Tube and  
Liquid Tube  
4
 
Table 2Accessory Usage  
REQUIRED FOR LOW-AMBIENT  
REQUIRED FOR LONG-LINE  
APPLICATIONS*  
ACCESSORY  
APPLICATIONS  
(BELOW 55°F)  
(OVER 50 FT)  
Crankcase Heater  
Evaporator Freeze Thermostat  
Compressor Start AssistCapacitor and Relay  
Puron® Low-Ambient Pressure Switch  
Wind Baffle  
Yes  
Yes  
No  
Yes  
Yes  
Yes  
No  
Yes  
See Low-Ambient Instructions  
Recommended  
No  
Support Feet  
No  
Hard Shutoff TXV  
Yes†  
Yes†  
See Long-Line  
Application Guideline  
Liquid-Line Solenoid Valve for Heating  
No  
* For tubing line sets between 50 and 175 ft, or when vertical difference is greater than 20 ft, refer to Application Guideline and Service Manual Residential Split-System  
Air Conditioners and Heat Pumps Using Puron®.  
Required for all applications.  
wrench an additional 1/12 turn (15 ft-lb). DO NOT OVER-  
TIGHTEN.  
5000  
4500  
REFRIGERANT TUBING AND FILTER DRIER  
4000  
LEAK IN  
SYSTEM  
3500  
3000  
Installation of filter drier in liquid line is required.  
2500  
Connect vapor tubing to fittings on outdoor unit vapor service  
valves. Connect liquid tube to filter drier. (See Table 1 and Fig. 8.)  
Use refrigerant grade tubing. Connect other end of filter drier to  
adapter tube on liquid service valve.  
2000  
VACUUM TIGHT  
TOO WET  
1500  
1000  
500  
TIGHT  
DRY SYSTEM  
SWEAT CONNECTION  
A95424  
0
1
2
3
4
5
6
7
MINUTES  
To avoid valve damage while brazing, service valves must be  
wrapped in a heat-sink material such as a wet cloth.  
A95424  
Fig. 9Deep Vacuum Graph  
Wrap service valves and filter drier with a wet cloth or heat-  
sinking material. Braze connections using either silver bearing or  
non-silver bearing brazing material. Do not use soft solder  
(materials which melt below 800°F.) Consult local code require-  
ments.  
LEAK CHECKING  
EVACUATE  
Leak test all joints in indoor, outdoor, and refrigerant tubing.  
EVACUATE REFRIGERANT TUBING AND INDOOR COIL  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
Never use the system compressor as a vacuum pump.  
Refrigerant tubes and indoor coil should be evacuated using the  
recommended deep vacuum method of 500 microns. The alternate  
triple evacuation method may be used if the procedure outlined  
below is followed.  
EVACUATE  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
IMPORTANT: Never open system under vacuum to atmosphere  
without first breaking it open with nitrogen.  
Deep Vacuum Method  
EVACUATE  
The deep vacuum method requires a vacuum pump capable of  
pulling a vacuum of 500 microns and a vacuum gage capable of  
accurately measuring this vacuum depth. The deep vacuum  
method is the most positive way of assuring a system is free of air  
and liquid water. (See Fig. 9.)  
CHECK FOR TIGHT, DRY SYSTEM  
(IF IT HOLDS DEEP VACUUM)  
Triple Evacuation Method  
CHARGE SYSTEM  
The triple evacuation method should only be used when vacuum  
pump is only capable of pumping down to 28 in. of mercury  
vacuum and system does not contain any liquid water. Refer to  
Fig. 10 and proceed as follows:  
A95425  
Fig. 10Triple Evacuation Method  
5
 
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
The unit cabinet must have an uninterrupted or unbroken  
ground to minimize personal injury if an electrical fault  
should occur. The ground may consist of electrical wire or  
metal conduit when installed in accordance with existing  
electrical codes. Failure to follow this warning can result in an  
electric shock, fire, or death.  
CONTACTOR  
FIELD POWER  
WIRING  
BLUE  
CONNECT GROUND AND POWER WIRES  
3 PHASE ONLY  
Connect ground wire to ground connection in control box for  
safety. Connect power wiring to contactor as shown in Fig. 11.  
FIELD GROUND  
WIRING  
GROUND  
LUG  
CONNECT CONTROL WIRING  
Route 24-v control wires through control wiring grommet and  
connect leads to control wiring. (See Fig. 12-17.)  
A94025  
Fig. 11Line Power Connections  
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If  
thermostat is located more than 100 ft from unit, as measured  
along the control voltage wires, use No. 16 AWG color-coded wire  
to avoid excessive voltage drop.  
1. Pump system down to 28 in. of mercury and allow pump to  
continue operating for an additional 15 minutes.  
2. Close service valves and shut off vacuum pump.  
All wiring must be NEC Class 1 and must be separated from  
incoming power leads.  
3. Connect a nitrogen cylinder and regulator to system and open  
until system pressure is 2 psig.  
Use furnace transformer, fan coil transformer, or accessory trans-  
former for control power, 24-v/40-va minimum.  
4. Close service valve and allow system to stand for 1 hr. During  
this time, dry nitrogen will be able to diffuse throughout the  
system absorbing moisture.  
NOTE: Use of available 24-v accessories may exceed the mini-  
mum 40-va power requirement. Determine total transformer load-  
ing and increase the transformer capacity or split the load with an  
accessory transformer as required.  
5. Repeat this procedure as indicated in Fig. 10. System will then  
be free of any contaminants and water vapor.  
FINAL TUBING CHECK  
IMPORTANT: Check to be certain factory tubing on both indoor  
and outdoor unit has not shifted during shipment. Ensure tubes are  
not rubbing against each other or any sheet metal. Pay close  
attention to feeder tubes, making sure wire ties on feeder tubes are  
secure and tight.  
FINAL WIRING CHECK  
IMPORTANT: Check factory wiring and field wire connections  
to ensure terminations are secured properly. Check wire routing to  
ensure wires are not in contact with tubing, sheet metal, etc.  
Step 11Compressor Crankcase Heater  
Step 10Make Electrical Connections  
When equipped with a crankcase heater, furnish power to heater a  
minimum of 24 hr before starting unit. To furnish power to heater  
only, set thermostat to OFF and close electrical disconnect to  
outdoor unit.  
To avoid personal injury or death, do not supply power to unit  
with compressor terminal box cover removed.  
A crankcase heater is required in long-line applications (tubing  
greater than 50 ft. or elevation greater than 20 ft. between indoor  
and outdoor units). Refer to Application Guideline and Service  
Manual for Residential Split-System Air Conditioners and Heat  
Pumps Using Puron® Refrigerant.  
Be sure field wiring complies with local and national fire, safety,  
and electrical codes, and voltage to system is within limits shown  
on unit rating plate. Contact local power company to correct  
improper voltage. See unit rating plate for recommended circuit  
protection device.  
Step 12Install Electrical Accessories  
NOTE: Operation of unit on improper line voltage constitutes  
abuse and could affect unit reliability. See unit rating plate. Do not  
install unit in system where voltage or phase imbalance (3-phase)  
may fluctuate above or below permissible limits.  
Refer to the individual instructions packaged with kits or acces-  
sories when installing.  
Step 13Start-Up  
NOTE: Use copper wire only between disconnect switch and  
unit.  
NOTE: Install branch circuit disconnect of adequate size per  
NEC to handle unit starting current. Locate disconnect within sight  
from and readily accessible from unit, per Section 440-14 of NEC.  
To prevent compressor damage or personal injury, observe  
the following:  
Do not overcharge system with refrigerant.  
Do not operate unit in a vacuum or at negative pressure.  
Do not disable low-pressure switch  
In scroll compressor applications:  
ROUTE GROUND AND POWER WIRES  
Remove access panel to gain access to unit wiring. Extend wires  
from disconnect through power wiring hole provided and into unit  
control box.  
Dome temperatures may be hot  
To prevent personal injury wear safety glasses, protective  
clothing, and gloves when handling refrigerant.  
6
 
CARRIER  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
CARRIER  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
ONE  
OUTDOOR  
THERMOSTAT  
HEAT  
PUMP  
FA, FB, FX  
FAN COIL  
HEAT  
PUMP  
FA, FB, FX  
FAN COIL  
R
R
G
R
24 VAC HOT  
W3  
R
R
G
24 VAC HOT  
R
G
INDOOR FAN  
HEAT STAGE 2  
INDOOR FAN  
HEAT STAGE 2  
*
*
*
W2  
W2  
G
W/W1  
Y/Y2  
W/W1  
Y/Y2  
E
COOL/HEAT  
STAGE 1  
ODT  
W2  
W2  
COOL/HEAT  
STAGE 1  
W3  
Y
E
RVS COOLING O/W2  
RVS COOLING O/W2  
O
NOT USED  
Y1/W2  
Y
NOT USED  
Y1/W2  
O
C
C
C
B
L
24 VAC COM  
NOT USED  
TROUBLE  
C
B
L
24 VAC COM  
NOT USED  
TROUBLE  
C
C
IF AVAILABLE  
*
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
CONNECTION  
CONNECTION  
A97561  
NOTE: Remove wires from crimp nut in indoor fan coil  
when installing outdoor thermostat.  
IMPORTANT: When using outdoor thermostat, W must be  
2
energized when requesting supplemental heat.  
A97562  
CARRIER  
CARRIER  
PROGRAMMABLE  
TWO  
OUTDOOR  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
FV4A  
FAN COIL  
THERMOSTAT  
MODEL HP  
HEAT  
PUMP  
FA, FB, FX  
FAN COIL  
HEAT  
PUMP THERMOSTATS  
DH  
R
J1 JUMPER  
R
ODT  
R
G
24 VAC HOT  
W3  
R
R
G
24 VAC HOT  
INDOOR FAN  
EHR  
R
G
INDOOR FAN  
HEAT STAGE 2  
W/W1  
Y/Y2  
HEAT STAGE 2  
G
W1  
W2  
W/W1  
Y/Y2  
COOL/HEAT  
STAGE 1  
J2 JUMPER  
W2  
W2  
Y
W2  
COOL/HEAT  
STAGE 1  
RVS COOLING O/W2  
Y
Y/Y2  
RVS COOLING O/W2  
EHR  
Y1/W2  
O
NOT USED  
Y1/W2  
O
O
NOT USED  
ODT  
E
C
B
L
C
24 VAC COM  
NOT USED  
TROUBLE  
C
C
B
L
24 VAC COM  
NOT USED  
TROUBLE  
EHR  
Y1  
C
C
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
CONNECTION  
CONNECTION  
A97564  
NOTE: Remove wires from crimp nut in indoor fan coil  
when installing outdoor thermostats.  
IMPORTANT: When using outdoor thermostats, W must be  
2
energized when requesting supplemental heat.  
A97563  
Fig. 12Typical 24-v Circuit Connections using Carrier Model HP Thermostat with Fan Coils and No Outdoor  
Thermostat, 1 Outdoor Thermostat, or 2 Outdoor Thermostats  
7
 
HEAT  
PUMP  
OTHER BRAND  
HP THERMOSTAT  
FA, FB, FX  
FAN COIL  
ONE  
OUTDOOR  
THERMOSTAT  
OTHER BRAND  
HP THERMOSTAT  
HEAT  
PUMP  
FA, FB, FX  
FAN COIL  
R
C
R
C
R
C
24 VAC HOT  
24 VAC COM  
HEAT STAGE 2  
ODT  
W3  
R
R
C
24 VAC HOT  
24 VAC COM  
HEAT STAGE 2  
R
*
W2  
W2  
C
C
W2  
W2  
Y
*
*
E
W3  
G
COOL/HEAT  
STAGE 1  
Y
W2  
Y
W2  
COOL/HEAT  
STAGE 1  
G
INDOOR FAN  
E
G
Y
INDOOR FAN  
O
E
RVS COOLING  
O
G
RVS COOLING  
O
EMERGENCY  
HEAT  
O
IF AVAILABLE  
*
EMERGENCY  
HEAT  
E
NOTE: Remove wires from crimp nut in indoor fan coil  
A97577  
when installing outdoor thermostat.  
IMPORTANT: When using outdoor thermostat, W must be  
2
energized when requesting supplemental heat.  
A97578  
HEAT  
TWO  
OTHER BRAND  
HP THERMOSTAT  
FV4A  
FAN COIL  
OTHER BRAND  
HP THERMOSTAT  
FA, FB, FX  
FAN COIL  
OUTDOOR  
HEAT  
PUMP  
PUMP  
THERMOSTATS  
DH J1 JUMPER  
R
24 VAC HOT  
24 VAC COM  
HEAT STAGE 2  
ODT  
*
W3  
R
R
C
R
C
24 VAC HOT  
24 VAC COM  
R
C
C
W2  
Y
EHR  
R
C
W2  
Y
C
W1  
W2  
W2  
J2 JUMPER  
W2  
Y
HEAT STAGE 2  
COOL/HEAT  
STAGE 1  
*
*
W2  
COOL/HEAT  
STAGE 1  
G
INDOOR FAN  
EHR  
Y/Y2  
Y
G
INDOOR FAN  
ODT  
E
G
O
O
RVS COOLING  
O
O
E
RVS COOLING  
G
EMERGENCY  
HEAT  
E
Y1  
O
EHR  
EMERGENCY  
HEAT  
IF AVAILABLE  
*
NOTE: Remove wires from crimp nut in indoor fan coil  
when installing outdoor thermostats.  
IMPORTANT: When using outdoor thermostats, W must be  
2
energized when requesting supplemental heat.  
A97579  
A97580  
Fig. 13Typical 24-v Circuit Connections using Other HP Thermostats with Fan Coils and No Outdoor  
Thermostat or 2 Outdoor Thermostats  
8
 
CARRIER  
DUAL FUEL  
THERMOSTAT  
MODEL DF  
CARRIER  
DUAL FUEL  
THERMOSTAT  
MODEL DF  
TWO-STAGE OR  
VARIABLE SPEED  
FURNACE  
SINGLE-STAGE  
FURNACE  
HEAT PUMP  
R
HEAT PUMP  
R
24 VAC HOT  
R
R
G
24 VAC HOT  
R
R
G
FAN  
G
FAN  
G
FURNACE  
COMPRESSOR  
RVS COOLING  
N/A  
W/W1  
Y/Y2  
W
Y
W2  
Y
FURNACE LO  
COMPRESSOR  
RVS COOLING  
FURNACE HI  
W/W1  
Y/Y2  
W/W1  
W2  
Y
Y/Y2  
O
O
O/W2  
O
O/W2  
W2  
Y1  
C
Y1/W2  
Y1/W2  
C
24 VAC COM  
RVS HEATING  
RVS SENSING  
C
B
L
C
C
24 VAC COM  
RVS HEATING  
RVS SENSING  
C
B
L
See note 7  
OUTDOOR  
TEMPERATURE  
SENSOR  
See notes 7 and 8  
S1  
S2  
S1  
S2  
OUTDOOR  
SENSOR  
CONNECTION  
OUTDOOR  
TEMPERATURE  
SENSOR  
OUTDOOR  
SENSOR  
CONNECTION  
A97538  
A97539  
Fig. 14Typical 24-v Circuit Connection using Carrier Model DF Thermostat with Single- or 2-Stage Furnace  
CARRIER  
PROGRAMMABLE  
THERMOSTAT  
MODEL 2S  
FV4A  
FAN COIL  
HEAT  
PUMP  
DH  
R
J1 JUMPER  
R
R
24 VAC HOT  
FAN  
G
G
Y/Y2  
W1  
COOL/HEAT  
STAGE 1  
Y
Y/Y2  
REMOVE  
J2 JUMPER  
FOR HEAT  
STAGING  
HEAT STAGE 2  
HEAT STAGE 3  
RVS COOLING  
W/W1  
Y1/W2  
W2  
O
W2  
O/W2  
O
24 VAC COMM  
RVS HEATING  
TROUBLE  
C
C
B
L
C
Y1  
S1  
S2  
OUTDOOR  
SENSOR  
CONNECTION  
Smart Sequencing Application: Model 2S thermostat with  
switch C OFF and switch D ON uses single-speed heat pump,  
FK4 fan coil with selected 2:1 size ratio heaters. Provides 3  
stages of auxiliary heat for even heating comfort via W/W1  
and Y1/W2. Refer to FK4 Installation Instructions.  
A97565  
Fig. 15Typical 24-v Circuit Connections using Carrier Model 2S Thermostat  
with FV4A Fan Coil and Smart Staging  
9
 
CARRIER  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
CARRIER  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
FA, FB, FX  
FAN COIL WITH  
SMART HEAT  
FA, FB, FX  
ONE  
HEAT  
PUMP  
HEAT  
PUMP  
FAN COIL WITH OUTDOOR  
SMART HEAT THERMOSTAT  
R
R
R
R
C
24 VAC HOT  
R
R
C
24 VAC HOT  
C
C
G
INDOOR FAN  
HEAT STAGE 2  
G
INDOOR FAN  
HEAT STAGE 2  
W/W1  
Y/Y2  
Y
G
W/W1  
Y/Y2  
Y
G
COOL/HEAT  
STAGE 1  
COOL/HEAT  
STAGE 1  
O
O
RVS COOLING O/W2  
O
RVS COOLING O/W2  
O
W2  
W2  
NOT USED  
Y1/W2  
W2D  
NOT USED  
Y1/W2  
W2D  
CUT  
JW1  
W2T  
ODT  
JW1  
C
B
L
W2T  
W3  
24 VAC COM  
NOT USED  
TROUBLE  
C
B
L
24 VAC COM  
NOT USED  
TROUBLE  
W3  
Y
Y
Y
0
Y
0
S1  
S2  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
OPTIONAL  
OUTDOOR  
SENSOR  
CONNECTION  
CONNECTION  
A97566  
A97567  
FA, FB, FX  
CARRIER  
FAN COIL WITH  
SMART HEAT  
HEAT  
PUMP  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
SUPPLEMENTAL  
HEATING  
RELAY  
R
C
R
G
R
C
24 VAC HOT  
INDOOR FAN  
HEAT STAGE 2  
SHR  
W/W1  
Y/Y2  
Y
G
COOL/HEAT  
STAGE 1  
O
RVS COOLING O/W2  
O
W2  
NOT USED  
Y1/W2  
W2D  
CUT  
JW1  
C
B
L
W2T  
W3  
24 VAC COM  
NOT USED  
TROUBLE  
SHR  
ODT  
Y
Y
0
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
CONNECTION  
A97568  
Fig. 16Typical 24-v Circuit Connections using Carrier Model HP Thermostat with Smart Heat and No Outdoor  
Thermostat, 1 Outdoor Thermostat, or Supplemental Heat Relay  
10  
 
FA, FB, FX  
FAN COIL WITH  
SMART HEAT  
FA, FB, FX  
FAN COIL WITH  
SMART HEAT  
OTHER BRAND  
HP THERMOSTAT  
HEAT  
PUMP  
OTHER BRAND  
HP THERMOSTAT  
HEAT  
PUMP  
R
C
R
C
R
C
R
C
R
C
R
C
24 VAC HOT  
24 VAC COM  
24 VAC HOT  
24 VAC COM  
COOL/HEAT  
STAGE 1  
COOL/HEAT  
STAGE 1  
Y
G
O
E
Y
G
Y
G
O
E
Y
G
INDOOR FAN  
INDOOR FAN  
O
O
O
RVS COOLING  
O
RVS COOLING  
EMERGENCY  
HEAT  
EMERGENCY  
HEAT  
W2  
W2  
W2D  
W2D  
CUT  
JW1  
JW1  
HEAT STAGE 2  
HEAT STAGE 2  
W2  
W2T  
W3  
W2  
W2T  
W3  
ODT  
Y
Y
Y
0
Y
0
A97582  
A97581  
FA, FB, FX  
FAN COIL WITH  
SMART HEAT  
HEAT  
PUMP  
OTHER BRAND  
HP THERMOSTAT  
R
C
R
C
R
C
24 VAC HOT  
24 VAC COM  
COOL/HEAT  
STAGE 1  
Y
G
O
E
Y
G
O
INDOOR FAN  
O
RVS COOLING  
EMERGENCY  
HEAT  
W2  
SHR  
W2D  
CUT  
JW1  
HEAT STAGE 2  
W2  
W2T  
W3  
SHR  
ODT  
Y
Y
0
A97583  
Fig. 17Typical 24-v Circuit Connections using Other HP Thermostats with Smart Heat and No Outdoor  
Thermostat, 1 Outdoor Thermostat, or Supplemental Heat Relay  
11  
 
LEGEND  
24-V FACTORY WIRING  
24-V FIELD WIRING  
FIELD SPLICE CONNECTION  
OUTDOOR THERMOSTAT  
EMERGENCY HEAT RELAY  
SUPPLEMENTAL HEAT RELAY  
ODT  
EHR  
SHR  
A97413  
WIRING DIAGRAM NOTES:  
1. CARRIER THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCURATE FOR MODEL NUMBERS TSTAT _ _ _ _ _ _ _.  
2. WIRING MUST CONFORM TO NEC LOCAL CODES.  
3. ALL UNITS ARE EQUIPPED WITH PRESSURE SWITCHES, TEMPERATURE SWITCH, AND 5-MINUTE COMPRESSOR CYCLE  
PROTECTION. CONNECT 24-V FIELD WIRING TO FACTORY-PROVIDED STRIPPED LEADS.  
4. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE COMPRESSOR CYCLE PROTECTION AND 4 CYCLES PER  
HR LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS.  
5. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR THERMOSTAT INSTALLATION INSTRUCTIONS.  
6. UNDERLINED LETTER ON DUAL TERMINAL INDICATES USAGE.  
FOR EXAMPLE: O/W2 MEANS O  
O/W2 MEANS W2  
7. OUTDOOR TEMPERATURE SENSOR MUST BE ATTACHED IN ALL DUAL FUEL INSTALLATIONS.  
JUMPER WIRE BETWEEN O/W2 AND L THERMOSTAT TERMINALS MUST BE PRESENT.  
8. Y1 AND O CONNECTIONS TO 2-STAGE FURNACES MAY NOT EXIST OR MAY ONLY BE A WIRE RATHER THAN A SCREW  
TERMINAL.  
Do not vent refrigerant to atmosphere. Recover during system  
repair or final unit disposal.  
Follow these steps to properly start up the system.  
1. Fully back seat (open) liquid and vapor service valves.  
2. Unit is shipped with valve stem(s) front seated (closed) and  
caps installed. replace stem caps after system is opened to  
refrigerant flow (back seated). Replace caps finger-tight and  
tighten with wrench an additional 1/12 turn. Use a backup  
wrench on valve body flats to prevent distortion of sheet  
metal.  
3. Close electrical disconnects to energize system.  
4. Set room thermostat at desired temperature. Be sure set point  
is below indoor ambient temperature.  
5. Set room thermostat to HEAT or COOL and fan control to ON  
or AUTO mode, as desired. Operate unit for 15 minutes.  
Check system refrigerant charge.  
A00010  
Fig. 18Phase Monitor Control  
Back seating service valves are not equipped with Schrader  
valves. Fully back seat (counter clockwise) valve stem before  
removing gage port cap.  
12  
 
conclusion of defrost mode, reversing valve will de-energize, the  
compressor will turn off for another 30 sec, and the fan will turn  
off for 40 sec, before starting in the heating mode.  
3phase scroll compressors are rotation sensitive.  
A flashing LED on phase monitor indicates reverse rotation.  
(See Fig. 18 and Table 3.)  
Defrost  
The defrost control is a time/temperature control which includes a  
field-selectable time period (DIP switch 1 and 2 on the board)  
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at  
90 minutes).  
This will not allow contactor to be energized.  
Disconnect power to unit and interchange 2 field wiring  
leads on unit contactor.  
SEQUENCE OF OPERATION  
To initiate a forced defrost, two options are available depending on  
the status of the defrost thermostat.  
NOTE: Defrost control board is equipped with a 5-minute lock-  
out timer which may be initiated upon an interruption of power.  
If defrost thermostat is closed, speedup pins (J1) must be shorted  
by placing a flat head screwdriver in between for 5 sec and  
releasing, to observe a complete defrost cycle. When the Quiet  
Shift switch is selected, compressor will be turned off for two 30  
sec intervals during this complete defrost cycle as explained  
previously. When Quiet Shift switch is in factory default OFF  
position, a normal and complete defrost cycle will be observed.  
With power supplied to indoor and outdoor units, transformer is  
energized.  
Cooling  
On a call for cooling, thermostat makes circuits R-O, R-Y, and  
R-G. Circuit R-O energizes reversing valve, switching it to cooling  
position. On three phase models with scroll compressors, the units  
are equipped with a phase monitor to detect if the incoming power  
is correctly phased for compressor operation. (See Fig. 18 and  
Table 3.) If the phasing is correct, circuit R-Y energizes contactor,  
starting outdoor fan motor and compressor circuit. R-G energizes  
indoor unit blower relay, starting indoor blower motor on high  
speed.  
If defrost thermostat is in open position, and speedup pins are  
shorted (with a flat head screwdriver) for 5 sec and released, a  
short defrost cycle will be observed (actual length is dependent  
upon the selected Quiet Shift position). When Quiet Shift switch is  
in ON position, the length of defrost is 1 minute (30 sec  
compressor off period followed by 30 sec of defrost with com-  
pressor operation). On return to heating operation, compressor will  
again turn off for an additional 30 sec and the fan for 40 sec. When  
the Quiet Shift is in OFF position, only a brief 30 sec cycle will be  
observed.  
NOTE: If the phasing is incorrect, the contactor will not be  
energized. To correct the phasing interchange any two of the three  
power connections on the field side.  
When thermostat is satisfied, contacts open, de-energizing the  
contactor and blower relay. Compressor and motors should stop.  
If it is desirable to observe a complete defrost in warmer weather,  
the thermostat must be closed as follows:  
NOTE: If indoor unit is equipped with a time-delay relay circuit,  
the blower runs an additional 90 sec to increase system efficiency.  
1. Turn off power to outdoor unit.  
2. Disconnect outdoor fan motor lead from OF2 on control board  
(See Fig. 19.) Tape to prevent grounding.  
Heating  
On a call for heating, thermostat makes circuits R-Y and R-G. If  
phasing is correct, circuit R-Y energizes contactor, starting out-  
door fan motor and compressor. Circuit R-G energizes indoor  
blower relay, starting blower motor on high speed.  
3. Restart unit in heating mode, allowing frost to accumulate on  
outdoor coil.  
4. After a few minutes in heating mode, liquid line temperature  
should drop below closing point of defrost thermostat (ap-  
proximately 30°F).  
Should temperature continue to fall, R-W2 is made through  
sec-stage room thermostat bulb. Circuit R-W2 energizes a se-  
quencer, bringing on first bank of supplemental electric heat and  
providing electrical potential to sec heater sequencer (if used). If  
outdoor temperature falls below setting of outdoor thermostat  
(field-installed option), contacts close to complete circuit and bring  
on sec bank of supplemental electric heat.  
NOTE: Unit will remain in defrost until defrost thermostat  
reopens at approximately 80°F coil temperature at liquid line or  
remainder of defrost cycle time.  
5. Turn off power to outdoor and reconnect fan motor lead to  
OF2 on control board after above forced defrost cycle.  
When thermostat is satisfied, its contactors open, de-energizing  
contactor and sequencer. All heaters and motors should stop.  
PressureGuardSwitch  
This outdoor unit is equipped with a heating vapor pressure  
limiting device, PressureGuard, which cycles the outdoor fan at  
high ambient heating conditions. The exact ambient at which  
outdoor fan cycles depends on indoor and outdoor unit sizing. The  
effect of outdoor fan cycling on HSPF (Heating Seasonal Perfor-  
mance Factor) is insignificant, due to its occurrence at outdoor  
ambients where building load is very low.  
TABLE 3PHASE MONITOR LED INDICATORS  
LED  
STATUS  
No call for compressor operation  
Reversed phase  
OFF  
FLASHING  
ON  
Normal  
Puron® is a high-pressure refrigerant. The purpose of this switch  
is to provide maximum flexibility and minimum cost for the  
installer/owner by not requiring special thicker wall vapor tubing  
and indoor coils, thus allowing limited retrofit. The use of this  
switch also allows the maximum number of indoor coil choices at  
minimum cost for the installer/owner, since it can use standard  
refrigeration tubing.  
Quiet Shift  
Quiet Shift is a field-selectable defrost mode, which will eliminate  
occasional noise that could be heard at the start of the defrost cycle  
and restarting of heating cycle. It is selected by placing DIP switch  
3 (on defrost board) in ON position.  
When Quiet Shift switch is placed in ON position, and a defrost is  
initiated, the following sequence of operation will occur. Revers-  
ing valve will energize, compressor will turn off for 30 sec, then  
turn back on to complete defrost. At the start of heating cycle after  
NOTE: Due to presence of a PressureGuard switch in outdoor  
unit fan circuit and the possibility of fan cycling, this unit may go  
into brief defrost at high ambient heating conditions.  
13  
 
CESO13007600  
Speedup  
Pins  
Quiet  
Shift  
Defrost interval  
DIP switches  
A99442  
Fig. 19Defrost Control  
Step 14Check Charge  
5. Refer to Table 4. Find the point where required subcooling  
temperature intersects measured liquid service valve pressure.  
UNIT CHARGE  
6. To obtain required subcooling temperature at a specific liquid  
line pressure, add refrigerant if liquid line temperature is  
higher than indicated or reclaim refrigerant if temperature is  
lower. Allow a tolerance of ± 3°F.  
Factory charge is shown on unit rating plate. To check charge in  
cooling mode, refer to Cooling Only Procedure. To check charge  
in heating mode, refer to Heating Check Chart Procedure.  
COOLING ONLY PROCEDURE  
HEATING CHECK CHART PROCEDURE  
NOTE: If superheat or subcooling charging conditions are not  
favorable, charge must be weighed in accordance with unit rating  
plate ± 0.6 oz/ft of 3/8-in. liquid line above or below 15 ft  
respectively.  
To check system operation during heating cycle, refer to the HEAT  
Pump Charging Instructions label on outdoor unit. This chart  
indicates whether a correct relationship exists between system  
operating pressure and air temperature entering indoor and outdoor  
units. If pressure and temperature do not match on chart, system  
refrigerant charge my not be correct. Do not use chart to adjust  
refrigerant charge.  
EXAMPLE:  
To calculate additional charge required for a 25-ft line set:  
25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge  
NOTE: In heating mode, check refrigerant charge only when  
pressures are stable. If operating conditions cause PressureGuard  
switch to open and outdoor fan to cycle, check refrigerant charge  
in cooling or lower indoor dry bulb temperature. If in doubt,  
remove charge and weigh in correct refrigerant charge.  
Units installed with cooling mode TXV require charging with the  
subcooling method.  
1. Operate unit a minimum of 10 minutes before checking  
charge.  
2. Measure liquid service valve pressure by attaching an accurate  
gage to service port.  
NOTE: When charging is necessary during heating season,  
charge must be weighed in accordance with unit rating plate ± 0.6  
oz/ft of 3/8-in. liquid line above or below 15 ft respectively.  
3. Measure liquid line temperature by attaching an accurate  
thermistor type or electronic thermometer to liquid near  
outdoor coil.  
EXAMPLE:  
To calculate additional charge required for a 25-ft line set:  
25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge  
4. Refer to Heat Pump Charging Instructions label on outdoor  
unit.  
14  
 
Table 4Required Liquid-Line Temperature (°F)  
REQUIRED SUBCOOLING TEMPERATURE  
(°F)  
REQUIRED SUBCOOLING TEMPERATURE  
(°F)  
LIQUID PRESSURE  
AT SERVICE VALVE  
LIQUID PRESSURE  
AT SERVICE VALVE  
5
10  
51  
53  
56  
58  
60  
62  
64  
66  
68  
70  
72  
74  
76  
77  
79  
81  
83  
84  
86  
88  
89  
91  
92  
94  
95  
97  
98  
100  
101  
102  
104  
105  
15  
46  
48  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
72  
74  
76  
78  
79  
81  
83  
84  
86  
87  
89  
90  
92  
93  
95  
96  
97  
99  
100  
20  
41  
43  
46  
48  
50  
52  
54  
56  
58  
60  
62  
64  
66  
67  
69  
71  
73  
74  
76  
78  
79  
81  
82  
84  
85  
87  
88  
90  
91  
92  
94  
95  
5
10  
15  
20  
174  
181  
188  
195  
202  
209  
216  
223  
230  
237  
244  
251  
258  
265  
272  
279  
286  
293  
300  
307  
314  
321  
328  
335  
342  
349  
356  
363  
370  
377  
384  
391  
56  
398  
405  
412  
419  
426  
433  
440  
447  
454  
461  
468  
475  
482  
489  
496  
503  
510  
517  
524  
531  
538  
545  
552  
559  
566  
573  
580  
587  
594  
601  
608  
112  
113  
114  
115  
117  
118  
119  
120  
122  
123  
124  
125  
126  
127  
129  
130  
131  
132  
133  
134  
135  
136  
137  
138  
139  
140  
141  
142  
143  
144  
145  
107  
108  
109  
110  
112  
113  
114  
115  
117  
118  
119  
120  
121  
122  
124  
125  
126  
127  
128  
129  
130  
131  
132  
133  
134  
135  
136  
137  
138  
139  
140  
102  
103  
104  
105  
107  
108  
109  
110  
112  
113  
114  
115  
116  
117  
119  
120  
121  
122  
123  
124  
125  
126  
127  
128  
129  
130  
131  
132  
133  
134  
135  
97  
58  
98  
61  
99  
63  
100  
102  
103  
104  
105  
107  
108  
109  
110  
111  
112  
114  
115  
116  
117  
118  
119  
120  
121  
122  
123  
124  
125  
126  
127  
128  
129  
130  
65  
67  
69  
71  
73  
75  
77  
79  
81  
82  
84  
86  
88  
89  
91  
93  
94  
96  
97  
99  
100  
102  
103  
105  
106  
107  
109  
110  
Step 15Final Checks  
CARE AND MAINTENANCE  
IMPORTANT: Before leaving job, be sure to do the following:  
1. Securely fasten all panels and covers.  
For continuing high performance and to minimize possible equip-  
ment failure, periodic maintenance must be performed on this  
equipment.  
2. Tighten service valve stem caps to 1/12-turn past finger tight.  
Frequency of maintenance may vary depending upon geographic  
areas, such as coastal applications.  
3. Leave Users Manual with owner. Explain system operation  
and periodic maintenance requirements outlined in manual.  
4. Fill out Dealer Installation Checklist and place in customer  
file.  
15  
 
PURON® (R-410A) QUICK REFERENCE GUIDE  
Puron® refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement components  
are designed to operate with Puron®.  
Puron® refrigerant cylinders are rose colored.  
Recovery cylinder service pressure rating must be 400 psig. DOT 4BA400 or DOT BW400.  
Puron® systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when charging into  
suction line with compressor operating.  
Manifold sets should be at least 700 psig high side and 180 psig low side with 550 psig low-side retard.  
Use hoses with 700 psig service pressure rating.  
Leak detectors should be designed to detect HFC refrigerant.  
Puron®, as with other HFCs, is only compatible with POE oils.  
Vacuum pumps will not remove moisture from oil.  
Do not leave Puron® suction line filter driers in line longer than 72 hrs.  
Do not use liquid-line filter driers with rated working pressures less than 600 psig.  
Do not install a suction-line filter drier in liquid line.  
POE oils absorb moisture rapidly. Do not expose oil to atmosphere.  
Poe oils may cause damage to certain plastics and roofing materials.  
Wrap all filter driers and service valves with wet cloth when brazing.  
A factory-approved liquid-line filter drier is required on every unit.  
Do not use an R-22 TXV.  
If indoor unit is equipped with an R-22 TXV, it must be changed to an Puron® TXV.  
All Puron® Heat Pumps must have indoor Puron® TXV.  
Never open system to atmosphere while it is under a vacuum.  
When system must be opened for service, recover refrigerant, break vacuum with dry nitrogen prior to opening to atmosphere. Evacuate to  
500 microns prior to recharging.  
Always replace filter drier after opening system for service.  
Do not vent Puron® into the atmosphere.  
Do not use capillary tube coils.  
Observe all warnings, cautions, and bold text.  
Copyright 2001 CARRIER Corp. 7310 W. Morris St. Indianapolis, IN 46231  
38eya3si  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 5a 5a  
1
4
PC 101  
Catalog No. 533-80006  
Printed in U.S.A.  
Form 38EYA-3SI  
Pg 16  
4-01  
Replaces: 38EYA-2SI  
 

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